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Plant Physiology 69:341-344 (1982)
© 1982 American Society of Plant Biologists

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Articles

Photosynthetic Response of Seagrasses to Ultraviolet-A Radiation and the Influence of Visible Light Intensity 1

Robert P. Trocine2, John D. Rice3 and Gary N. Wells4

Department of Biology, Florida Institute of Technology, Melbourne, Florida 32901

Inhibition of photosynthesis by ultraviolet-A radiation (UV-A, 315-380 nanometers) was examined in three marine angiosperms: Halophila engelmannii Aschers, Halodule wrightii Aschers, and Syringodium filiforme Kütz. Sensitivity to UV-A and photosensitization to UV-A by photosynthetically active radiation (PAR, 380-700 nanometers) were characterized.

Net photosynthesis by Halodule and Syringodium was unaffected by UV-A irradiation in the absence of PAR. Irradiation of Syringodium by a combined beam of UV-A and PAR resulted in photosynthetic inhibition. The depression of net photosynthesis was found to be a function of PAR intensity at a fixed level of UV-A irradiation. Inhibition of photosynthesis in Halodule by the combined beam was minimal and suggests adaptation to environmental irradiation levels.

Halophila was the only species examined, subject to photosynthetic inhibition by UV-A in the absence of PAR. Irradiation with PAR intensities characteristic to Halophila in the natural system as the combined beam, appeared to negate the inhibition. Increasing the PAR component of the combined beam above environmental norms resulted in photosynthetic inhibition greater than that observed for UV-A alone.

2 Present address: Department of Oceanography, Florida Institute of Technology, Melbourne, FL 32901.

3 Present address: IFAS-Agricultural Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850.

4 To whom all correspondence should be addressed.

1 This work was performed with the support of National Aeronautics and Space Administration Contract No. NAS9-15846, National Science Foundation Grant No. SER77-06567 and by a grant from the Dean's Research Fund, Florida Institute of Technology.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1982 by the American Society of Plant Biologists